Asterisk PJSIP Channel Driver DoS (AST-2014-009)

This script is Copyright (C) 2014-2017 Tenable Network Security, Inc.


Synopsis :

A telephony application running on the remote host is affected by a
denial of service vulnerability.

Description :

According to the version in its SIP banner, the version of Asterisk
running on the remote host is potentially affected by a denial of
service vulnerability in the PJSIP channel driver. This is due to a
flaw in the 'res_pjsip_pubsub' module. The issue is triggered when
handling a SIP SUBSCRIBE request with unexpected mixes of headers for
a given event package. By using a specially crafted request, a remote
attacker could exploit this to crash the application.

Note that Nessus has not tested for this issue but has instead relied
only on the application's self-reported version number.

See also :

http://downloads.asterisk.org/pub/security/AST-2014-009.html
https://issues.asterisk.org/jira/browse/ASTERISK-24136
http://www.nessus.org/u?4752d776

Solution :

Upgrade to Asterisk 12.5.1 or apply the appropriate patch listed in
the Asterisk advisory.

Risk factor :

Low / CVSS Base Score : 2.1
(CVSS2#AV:N/AC:H/Au:S/C:N/I:N/A:P)
CVSS Temporal Score : 1.8
(CVSS2#E:ND/RL:OF/RC:C)
Public Exploit Available : false

Family: Misc.

Nessus Plugin ID: 77858 ()

Bugtraq ID: 69972

CVE ID: CVE-2014-6609

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